California Proposition 65: This product contains a chemical known to the State of California to cause cancer. California Proposition 65: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm.Silicon Carbide Gel Water Mix, Gray, Container Type Jar, Size 1 lb., Application Lapping, Honing and Grinding Valve Seats, Gear Teeth, Dowel Holes In Dies, Bushings, Flat Surfaces On Seals and Castings, Machining Parts, Shafts, Knives and Cutting Blades, Grade C, Grit 220